8, Without a normal binding process, the probability of losing control will
increase a lot.
9, If the receiver is tested without its antenna, you can only know whether
the receiver works or not. It does not show whether the interference among the
airborne devices.
10, The basis for selecting the receiver antenna is the PQT (digitally) not
the RSSI (analog mode), so the antenna selection does not work under strong
signal. It will work if the distance is increased. The RSSI antenna selection has
the disadvantage of misjudging the interfering signal. In the PQT mode, if tested
with only one receiving antenna, there may be a misjudgment in a short distance,
because the RF switch only has 25DB isolation. (If you do not understand this
paragraph, please do not worry. You can use it normally without reading this
paragraph).
11, If you disassemble the transmitter to adjust it without authorization, it
may cause the amplifier of self-excitation, which will result in the deterioration
or damaging of the transmitter .
12, The receiver fears vibration because the narrow-band communication
requires a high precision of frequency stability. The crystal oscillator is made of
quartz, which also play important role in the gyroscopes. So it is necessary to
protect the receiver the same as the gyroscopes.
13, If the receiver is connected to many servos, there needs to be a very
high power supply. The operating current for a micro servo will reach more than
1A. The operating current for a standard servo will reach more than 2A.
14, The servos of poor quality would cause serious troubles. When there is
a long distance, as soon as the servo moves, the RSSI indicator will blink. The
replacement of high-quality servos would greatly improve the long range
operation.
15, The digital ground and RF ground for the R4047NB20 receiver are
separated by a filter. If accidentally there is a short circuit of the power supply
and RF ground, (MCX skin with the 12V or 5V short circuit), the R4047NB20
may be damaged. The MCX connector skin also cannot get in touch with the
carbon fiber or other ground loops in case of interfering getting in.
